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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Green-solvent processable semiconducting polymers applicable in additive-free perovskite and polymer solar cells: molecular weights, photovoltaic performance, and thermal stability

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Title
Green-solvent processable semiconducting polymers applicable in additive-free perovskite and polymer solar cells: molecular weights, photovoltaic performance, and thermal stability
Author
Lee, JunwooLee, Tack HoByranvand, Mahdi MalekshahiChoi, KyoungwonKim, Hong IlPark, Sang AhKim, Jin YoungPark, Taiho
Issue Date
201804
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.14, pp.5538 - 5543
Abstract
In this study, we demonstrated the effects of the molecular weight (MW) of a green-solvent processable semiconducting polymer (asyPBTBDT) on its photovoltaic performance and device thermal stability in green processed devices for the first time. The asy-PBTBDT with a high MW(132 kDa) had the highest mh values (4.91 x 10(-3) cm(2)V(-1) s(-1) without dopants and 5.77 x 10(-3) cm(2)V(-1) s(-1) with dopants) as a result of increase in the p-p stacking along with MW as compared to lowMW asy-PBTBDTs (27 and 8 kDa). The high-MW asy-PBTBDT with a high mh achieved the best power conversion efficiencies of 18.2% and 20.0% for the undoped and doped states in PerSCs, respectively, and 5.7% in PSCs in green processed devices. Furthermore, the glass transition temperature increased with an increase in MW; this indicated an effective decrease in heat-induced morphological degradation in the photovoltaic devices. In addition, an increase in the chain density along with MW led to good robustness against humidity and oxygen.
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DOI
http://dx.doi.org/10.1039/c8ta00479j
ISSN
2050-7488
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